MV motors & Vacuum contactors
MV motors & Vacuum contactors
(OP)
Vacuum contactors for motors are specified to be non-latched type normally.
Have any one come across latched type ones for maotor duty.
If so, what circumstances require such use.
Thanks in anticipation.
Have any one come across latched type ones for maotor duty.
If so, what circumstances require such use.
Thanks in anticipation.





RE: MV motors & Vacuum contactors
Does it have to be a vacuum contactor? Or will any sealed type (IP66) do - to prevent the ingress of contamination.
To my knowledge, Bi-stable or latched type contactors are NOT generally used for motor applications because they are NOT fail safe.
Regards,
RE: MV motors & Vacuum contactors
I can't speak for overseas practice, but in the UK there are some quite distinct differences in the way motors are switched at MV when compared with LV, the use of circuit breakers instead of contactors being one of the main ones.
RE: MV motors & Vacuum contactors
RE: MV motors & Vacuum contactors
RE: MV motors & Vacuum contactors
RE: MV motors & Vacuum contactors
Recollect that fantastic presentation by M/s TOSHIBA about the use of Fuse backed up VAC Contactor for motor feeders back in TCE? I will arrange a copy for you. Send me the e-mail address.
Best regards
RE: MV motors & Vacuum contactors
As ruelvb pointed out there may be more problems with the latching type contactors than benefits.
Latching type contactors (MV or LV) would only be used for manual starters and if restaring the motor upon restoration of power after an outage is not a problem. IMHO any process that requires quick restarts, shall still be controlled by a seprate control/automation system and not rely on a latching type starters/contactors.
If you are worried about chattering type of issue for a electrical held contactor, then provide a stable source of control power (for example 110V DC baked up by batteries or UPS).